It's probably partially that devices are tested individually, and a large collection of compliant devices can put out quite a bit of total RF. This isn't just a

It's probably partially that devices are tested individually, and a large collection of compliant devices can put out quite a bit of total RF. This isn't just a cryptocurrency mining problem; even before that was invented, the total RF emissions of our modern technological society had already pushed up the RF noise floor substantially. HF ham radio is often near-unusable in urban areas and licensed UHF/VHF business radio users have had to push up their power compared to what was previously allowed in order to get the range they need.